In addition to sending your content updates to Facebook and Yahoo!, the WordPress.com Publicize feature also supports Twitter updates. A full description of the feature can be found at the Publicize WordPress.com Support page.

If you’re using the built-in WordPress.com Sharing buttons, we have a helper function to customize the “/via” tag appended to Tweets. Just add the following to your functions.php and change the argument to the username you want attributed.